Vertical drier



Dec. 21, 1937. c. A. DICKHAUT ET Al. 2,103,110

VERTICAL DRIER Filed April 11, 1936 ATToRNEY5,

Patented Dec. 21, we?

orfics.

VERTICAL D R/KER Charles A. Dickhaut and Sterling w. Warner, NewBrunswick, N. J., assignors to John Waldron Corporation, New Brunswick,N. 3., a corporation of New Jersey Application April 11, 1936, SeriaiNo. 13,878

8 Claims. (Cl. 3i-48) This invention relates to vertical driers forcoated paper, textiles, and other web material. Coated paper is dried invarious forms of driers such as festoon driers wherein paper is carriedin festoons on sticks or in floating driers where the paper is.supported by air pressure or is dried when only coated on one side bydrying drums. In many forms of coating such as in the case of varnishes,lacquers and emulsions, the coatings become tacky when partially driedand hence can only be coated on one side otherwise the web will adhereto the sticks. It, therefore, is necessary to coat one side anddry same,and then to coat the other side. As the 5 length of time required foroxidizing necessitates a rather slow speed a double coating materiallyincreases the cost. Even where only one side is coated and dried at onetime, the stick mark settings are sometimes discernible. Where attemptshave been made to dry the web by suspension from one edge, thecontraction of the web in drying is sufiiciently great to createwrinkles, marring of the coating and considerable wastage by breakage.Attempts to overcome this by releasing the gripping mechanisms and thenregripping the web have not been enprovide a drier wherein paper or thelike after 4 being coated may be dried on edge regardless of the'widthof the paper.

A- still further object of the invention is to 40 provide a verticaldrier wherein the web during drying may be relieved of the-strain set upby the contraction while at the same time the travelling web ismaintained at the same level.

A stillfurther object of the invention is to provide a drier that isadapted to dry paper coated with any material economically andendciently whether coated on one side or both sides. Referring to thedrawing:

Figure 1 is a plan view of a coating and drying device embodying theprinciples of our invention. i

Figure 2 is a detail view of the spiked wheel transfer means. Figure 3is a detail view of a: modified form of transfer means.

Still another object of the invention is to,

In carrying out our invention, we propose to provide a chamber 1 withinwhich any arrangement of dryingmedium may be used such as steam, hotair, etc. i

We have provided pipes 2 in Figure .1 for the drying medium. Doors 3function to permit entry into the drying chamber and also as vents.

Chamber l contains a plurality of passes of a travelling carrier 4wherein the web of paper It is carried by the usual gripper mechanismssecured to travelling carrier d. A carrier 5 oper ates from the unwindmechanism 1 around sprocket 6 where the web is automatically gripped andcarried through chamber I around sprockets 8 and 9, andthence exteriorlyof chamber 5 around sprockets it, H, 12 and i3, and thence back throughchamber i and around sprocket 6. At sprocket H, the carrier 5 leaves theweb It. The web it passes through vertical coater rolls l5 and is againpicked up by carrier 5 adjacent sprocket it where it is carried bycarrier 5 through chamber l for the initial drying. Any well known meansare utilized for 'maintaining carrier 5 taut, such as a tension meansbetween sprocket l2 and tension device iii. Carrier 5 is generallyoperated at a greater speed than carrier i. Carrier i is generallymaintained at a constant speed. As carrier 5 is an independent carrierits speed can be varied with respect to the speed of carrier d. Thecarrier 5 maintains the coated web quite taut. This is partially due tothe drying effect. We have found that the major part of the shrinkage of"the Web after coating and during drying will occur in the first pass,that is, while being borne by carrier 5. Therefore, if the tension ofthe web is relieved after the initial drying no further transfers arerequired. In addition, as the carrier t is travelling at a lesser speedthan carrier 5, there will be sufficient looseness of theweb to permitthe web to make the returns for the various passes of carrier i withoutthe web tearing from the grippers or the grippers becoming opened.

After carrier cleaves chamber 5 with the coated web the web passesaround spiked wheel ll where it is imbedded thereon bybrush wheel It.

In the modified form shown in Figure 3, the brush wheel in is replacedby a grooved wheel 23. Carrier A passing around sprocket wheel 22 hasthe grippers pick up web it from spiked wheels 51. The speed of carrierd 'being less than carrier 5, relieves the tension in web I teliminating the strain and any wrinkles with the web sufficiently looseto permit reversal for the requirednumber out of chamber l to rewindmechanism l9. Carrier 4 leaves the web at sprocket 20 to again completeits cycle. Utilization of the transfer means shown prevents the slippingof the material )during the transfer operation and the maintenance ofthe material at the proper level. The maintenance of the edge of the webin the same horizontal plane with relief of tension occasioned bycontraction on drying are vital elements in successfully drying coatedpaper and the like in the vertical plane. Furthermore, the paper musthave a certain amount of moisturedriven off before the tension isrelieved since certain papers when wet have very little strength and arelease of the grippers with subsequent regripping while wet will tearthe web. In our invention, the necessary amountof moisture is driven offprior to the regripping of the web.

Various modifications may be made and still fall within the scope of ourinvention. For instance, the unwind web mechanism may be placed"adjacent the coating mechanism and in such case continuous carrierhaving mechanisms for grip-1 there will be no preliminary drying. Wepreferably dry the web preliminary to coating so that there will be abetter bonding eifect between the coating and the web and a more uniformweight of coated paper will be produced. Also variations in coatingmechanisms may be utilized. Any well known type of gripping means orcarrier chains may be used.

What we claim is:

1. Ina drier, a drying chamber, a plurality of carriers havingmechanisms for gripping by one edge a vertical web of material andtransporting the same through said chamber, means for transferring saidweb from one carrier to another, and means for operating said carriersat different speeds. e

2. In a drier, a drying chamber, a single pass ping by one edge avertical web of material and transporting the same through said chamber,a second continuous carrier with a plurality of passes and havingmechanisms for supporting by one edge a vertical web of material, saidsecond carrier being motivated at a lesser speed than said firstcarrier, and means for transferring said web from said first carrier tosaid second carrier without slippage or breakage of said web.

' 3. In a drier, a drying chamber, means for carrying a web of materialthrough said chamber for preliminary drying after treatment, means forcarrying said web a plurality of passes through said chamberforadditional drying, and means for transferring said web from onecarrying means to another, said transfer means including a pinwheel andcooperating mean'safor impaling the web on said pinwheel.

'4. In a drier, a drying chamber, means for carrying a web of materialthrough said chamother.

. 2,103,110 of passes through chamber I. Web ll then passes berfonpreliminary drying after treatmenhmeans for carrying said web aplurality of passes through said chamber for additional drying, saidinitial carrying means being motivated at a greater rate of speed thansaid additional carrying means, meansfor transferring said web from onecarrying means to another, said transfer means comprising a pinwheel anda brush wheel for impaling said web on said pinwheel.

5. In a drier, a drying chamber, means for carrying a web of materialthrough said chamber for preliminary drying after treatment, means forcarrying said web a plurality of passes through said chamber foradditional drying, said initial carrying means being motivated at agreater rate of speed than said additional carrying means, and means fortransferring said web from one carrying means to another, said transfermeans comprising a pinwheel and a grooved wheel cooperating therewith toimpale said web on said pinwheel.

6. In a drier, a drying chamber, a web-treating mechanism, an unwindmechanism fora web of material, means for carrying said web in verticalposition from said unwind mechanism through.

a plurality of passes through said drier, and

means for transferring said web from one carrying means to the other.

7. In a drier, a drying chamber, a web-treating mechanism, an unwindmechanism for a web of material, means for carrying said web of materialin vertical position from said unwind mechanism through said dryingchamber for preliminary drying to said web treating mechanism and thenceagain through said drying chamber fora'n initial drying of said treatedweb, additional means for carrying said treated web in vertical positionat a slower speed a plurality of passes through said drier, and meansfor transferring said web from one carrying means to the other,

said transferring means comprising a pinwheel and an impaling wheel forimpaling said web on tional means for carrying said web in verticalposition and at a slower speed over a plurality of passes through saiddrier, and means for transferring said web from, one carrying means tothe CHARLESADICKHAUT. STERLING WLWARNER.

